diff --git a/README.md b/README.md
index eeb40f4..a34b862 100644
--- a/README.md
+++ b/README.md
@@ -123,7 +123,7 @@ binaries.
         libssl-dev uuid-dev python3 libmagic-dev libfreetype6-dev \
         libcurl4-openssl-dev libbz2-dev yasm libharfbuzz-dev ragel \
         libarchive-dev libtiff5 libpng16-16 libpango1.0-dev \
-        libxml2-dev libopenjp2-7-dev
+        libxml2-dev libopenjp2-7-dev libleptonica-dev
    ```
 
 2. Build
diff --git a/src/main.c b/src/main.c
index b9fd1eb..7f17956 100644
--- a/src/main.c
+++ b/src/main.c
@@ -274,7 +274,7 @@ int main(int argc, const char *argv[]) {
 
     if (arg_version) {
         printf(Version);
-        exit(0);
+        goto end;
     }
 
     if (LogCtx.very_verbose != 0) {
@@ -286,12 +286,12 @@ int main(int argc, const char *argv[]) {
 
     if (argc == 0) {
         argparse_usage(&argparse);
-        return 1;
+        goto end;
     } else if (strcmp(argv[0], "scan") == 0) {
 
         int err = scan_args_validate(scan_args, argc, argv);
         if (err != 0) {
-            return err;
+            goto end;
         }
         sist2_scan(scan_args);
 
@@ -299,7 +299,7 @@ int main(int argc, const char *argv[]) {
 
         int err = index_args_validate(index_args, argc, argv);
         if (err != 0) {
-            return err;
+            goto end;
         }
         sist2_index(index_args);
 
@@ -307,19 +307,19 @@ int main(int argc, const char *argv[]) {
 
         int err = web_args_validate(web_args, argc, argv);
         if (err != 0) {
-            return err;
+            goto end;
         }
         sist2_web(web_args);
 
     } else {
         fprintf(stderr, "Invalid command: '%s'\n", argv[0]);
         argparse_usage(&argparse);
-        return 1;
+        goto end;
     }
     printf("\n");
 
+    end:
     scan_args_destroy(scan_args);
-
     index_args_destroy(index_args);
     web_args_destroy(web_args);
 
diff --git a/src/parsing/media.c b/src/parsing/media.c
index a3436b3..b168cb2 100644
--- a/src/parsing/media.c
+++ b/src/parsing/media.c
@@ -5,7 +5,7 @@
 #define AVIO_BUF_SIZE 8192
 
 __always_inline
-AVCodecContext *alloc_jpeg_encoder(int dstW, int dstH, float qscale) {
+static AVCodecContext *alloc_jpeg_encoder(int dstW, int dstH, float qscale) {
 
     AVCodec *jpeg_codec = avcodec_find_encoder(AV_CODEC_ID_MJPEG);
     AVCodecContext *jpeg = avcodec_alloc_context3(jpeg_codec);
@@ -78,7 +78,7 @@ AVFrame *scale_frame(const AVCodecContext *decoder, const AVFrame *frame, int si
 }
 
 __always_inline
-AVFrame *read_frame(AVFormatContext *pFormatCtx, AVCodecContext *decoder, int stream_idx, document_t *doc) {
+static AVFrame *read_frame(AVFormatContext *pFormatCtx, AVCodecContext *decoder, int stream_idx, document_t *doc) {
     AVFrame *frame = av_frame_alloc();
 
     AVPacket avPacket;
@@ -135,7 +135,7 @@ AVFrame *read_frame(AVFormatContext *pFormatCtx, AVCodecContext *decoder, int st
     text_buffer_destroy(&tex);
 
 __always_inline
-void append_audio_meta(AVFormatContext *pFormatCtx, document_t *doc) {
+static void append_audio_meta(AVFormatContext *pFormatCtx, document_t *doc) {
 
     AVDictionaryEntry *tag = NULL;
     while ((tag = av_dict_get(pFormatCtx->metadata, "", tag, AV_DICT_IGNORE_SUFFIX))) {
@@ -160,8 +160,7 @@ void append_audio_meta(AVFormatContext *pFormatCtx, document_t *doc) {
 }
 
 __always_inline
-void
-append_video_meta(AVFormatContext *pFormatCtx, AVFrame *frame, document_t *doc, int include_audio_tags, int is_video) {
+static void append_video_meta(AVFormatContext *pFormatCtx, AVFrame *frame, document_t *doc, int include_audio_tags, int is_video) {
 
     if (is_video) {
         meta_line_t *meta_duration = malloc(sizeof(meta_line_t));
diff --git a/src/parsing/pdf.c b/src/parsing/pdf.c
index d51069a..41b3aeb 100644
--- a/src/parsing/pdf.c
+++ b/src/parsing/pdf.c
@@ -82,15 +82,14 @@ int render_cover(fz_context *ctx, document_t *doc, fz_document *fzdoc) {
 
     fz_drop_buffer(ctx, fzbuf);
     fz_drop_pixmap(ctx, pixmap);
+    fz_drop_page(ctx, cover);
 
     if (err != 0) {
         LOG_WARNINGF(doc->filepath, "fz_new_buffer_from_pixmap_as_png() returned error code [%d] %s", err,
                      ctx->error.message)
-        fz_drop_page(ctx, cover);
         return FALSE;
     }
 
-    fz_drop_page(ctx, cover);
     return TRUE;
 }
 
@@ -102,7 +101,7 @@ void fz_err_callback(void *user, UNUSED(const char *message)) {
 }
 
 __always_inline
-void init_ctx(fz_context *ctx, document_t *doc) {
+static void init_ctx(fz_context *ctx, document_t *doc) {
     fz_disable_icc(ctx);
     fz_register_document_handlers(ctx);
 
@@ -112,7 +111,8 @@ void init_ctx(fz_context *ctx, document_t *doc) {
     ctx->error.print = fz_err_callback;
 }
 
-int read_stext_block(fz_stext_block *block, text_buffer_t *tex) {
+__always_inline
+static int read_stext_block(fz_stext_block *block, text_buffer_t *tex) {
     if (block->type != FZ_STEXT_BLOCK_TEXT) {
         return 0;
     }
@@ -199,7 +199,7 @@ void parse_pdf(void *buf, size_t buf_len, document_t *doc) {
     fz_catch(ctx)
         err = ctx->error.errcode;
 
-    if (err) {
+    if (err != 0) {
         fz_drop_stream(ctx, stream);
         fz_drop_document(ctx, fzdoc);
         fz_drop_context(ctx);
@@ -280,12 +280,12 @@ void parse_pdf(void *buf, size_t buf_len, document_t *doc) {
 
             fz_var(err);
             fz_try(ctx)
-                        fz_run_page(ctx, page, dev, fz_identity, NULL);
+                fz_run_page(ctx, page, dev, fz_identity, NULL);
             fz_always(ctx)
-                {
-                    fz_close_device(ctx, dev);
-                    fz_drop_device(ctx, dev);
-                }
+            {
+                fz_close_device(ctx, dev);
+                fz_drop_device(ctx, dev);
+            }
             fz_catch(ctx)
                 err = ctx->error.errcode;